Your muscles will atrophy--get smaller and weaker--if you are in a cast or otherwise immobilized. If your leg was in a cast, there are a number of exercises you can do to build up again, including leg extensions, calf raises, and step-ups. Work both legs, but do more with the weak one. Even climbing stairs will help. Ask you doctor to refer you to a physical therapist who can show you the exercises that will be best and safest for you.

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